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DJI S900 overview

Supporting a total takeoff weight of 18 pounds, the Spreading Wings S900 with Zenmuse Z15-BMPC Gimbal is a hexcopter from DJI that allows you to capture aerial video using a separately available Blackmagic Pocket Camera camera. It features carbon fiber frame arms to cut down on weight, which fold down for storage and transport. The included Z15-BMPC gimbal helps keep the camera stabilized and isolated from vibration, and allows you to pan, tilt, and even cant the camera for more dynamic shots. Used with a 6S 12000mAh battery, available separately, the S900 can fly for up to 18 minutes fully laden.

This version of the S900 features the DJI A2 flight control system, a collection of hardware which acts as the hexcopter's brains. It takes data from the GPS, gyros, barometer, and other sensors while applying any pilot inputs to help ensure stable flying and smooth video. The A2 can be configured for different flying styles and pilot skill levels, with features like Intelligent Orientation Control (IOC), Point of Interest (POI), one motor fail protection, and a Return-to-Home fail safe in the event contact is lost with the transmitter. Thanks to CAN-bus peripheral ports, A2 can integrate other accessories, such as the Lightbridge unified video, data, and control system.

The S900 is not a ready-to-fly (RTF) aircraft. It does require some assembly and a transmitter (hand-held radio controller) and batteries are not included. Transmitters the A2 supports include the Futaba FASST and DJI DESST series. For power, it uses LiPo flight batteries in 6S configuration, with a 10,000 to 15,000 mAh capacity, and requires a discharge rate of at least 15C.

Zenmuse Z15-BMPC 3-Axis Gimbal

The Zenmuse Z15-BMPC is a 3-axis gimbal that provides stabilization and control over camera movement for the Blackmagic Pocket Camera camera. All the wires for power and video signal pass through the tubes of the Gimbal, allowing each axis to rotate without limitation. The Yaw (pan) can achieve full ±360° rotation while the Pitch can tilt the camera ±360°, and the Roll control can cant the camera ±40°, the latter helping keep the horizon level. Additionally, the gimbal features a precision control of ±0.01° making very precise camera movements possible

Three Working Modes

The Zenmuse Z15 features the following three modes:

Orientation-locked control

Non orientation-locked control

FPV mode

Airframe Design

Folding Arms

The prop arms are made of carbon fiber, which is used because of its high strength-to-weight ratio. For transport and storage, the arms fold down while the propellers split down the middle further reducing its size

Retractable Landing Gear

The landing gear raise above the level of the gimbal during flight to give you a full 360° of shooting. In addition, the gimbal bracket is separated from the main airframe by specifically designed dampers. This significantly reduces high-frequency vibrations to help make your shots clearer and sharper

Removable Upper Center Board

The upper center board can be removed, allowing access to the flight controller and IMU, and giving you a convenient way to setup the power distribution system. This design also simplifies installation of the main controller, iOSD, Lightbridge, or any other accessories that interface with the flight computer

Secure Power Distribution System

Gold-plated metal bearings with a unique screw design secure the power cords, ensuring cables will not come loose during flight and are designed to provide easy setup

Sparkproof Plug

The terminal connectors on the electrical wiring are shrouded to prevent accidental short circuiting and possible damage to sensitive electronics when connecting or removing them

Performance

Greater Power

A 40A electronic speed controller (ESC) is built in to each arm. Combined with its 4114 motors, high performance 1552 folding propellers, and V-type mixer design, the S900 has a maximum thrust of 5.5 lb. The motor adopts a single wire stator design, offering improved heat dissipation, better performance, and a more reliable system than earlier models

Angled Arm Design

Each arm is designed with an 8° inversion and a 3° inclination, making the aircraft more stable when rolling and pitching, yet more flexible when rotating

A2 Flight Control System

This version of the S900 Hexcopter features the DJI A2 flight control system. This system includes the main controller, IMU, GPS, PMU, and Bluetooth LED indicator

Main Controller The aircraft's equivalent of a CPU. The main controller takes pilot input and, factoring in data from the IMU, GPU, and other sources, instructs the ESCs at the motors. In addition, the A2 main controller incorporates a 2.4 GHz DR16 receiver which is compatible with Futaba FASST series and DJI DESST series transmitters (radio controllers). To connect peripherals, the main unit features a CAN-bus terminal with 12 output channels

IMU The IMU, or inertial measurement unit, is the primary source of information used by the flight controller so that the aircraft can maintain a stable flying condition. It uses a combination of accelerometers and gyros to collect this data

GPS The GPS allows the S1000 to keep track of where it is in two-dimensional flight. This enables various types of assisted flying not otherwise possible, such as keeping the aircraft in a fixed hover while shooting video. A high gain antenna mounts on the end of a stock installed on top of the frame

PMU The power management unit (PMU) regulates power being fed to the flight controller and other components. It features voltage detection and alarming, and had an extendable CAN-bus port

LED Bluetooth Indicator The LED-BTU-I module provides a USB and Bluetooth connectivity required so you can adjust various flight control parameters using a computer or mobile device. Bluetooth wireless communications can be extend using the 2.4G Bluetooth Datalink, which relays Bluetooth data over 2.4 GHz Wi-Fi for use with the iPad Ground Station, a waypoint-based autopilot mapping system

Intelligent Orientation Control (IOC)

On multi-rotor aircraft-- as with airplanes--pressing "forward" on the transmitter (radio controller) moves the nose forward. However, because multi-rotors are largely symmetrical, it can be easy to lose track of which way the nose is pointing, causing the controls to become counter-intuitive. To avoid this, IOC--when enabled using the assistant software--defines movement relative to the pilot so that, for example, pressing forward will always result in the aircraft moving forward from the pilot's perspective

Point of Interest (POI)

When the GPS signal is good, users can record the current position of the aircraft as a point of interest by a preset switch on the transmitter (radio controller). The aircraft can achieve a circling flight around the point of interest with the nose pointing at the POI in an area of 16.4 to 1,640' radius, when the roll command is given. This function is ideal for shooting of a fixed or stationary object, creating an aerial tracking shot

Intelligent Landing Gear Function

Once you enable the Intelligent Landing Gear function in the assistant software, the landing gear will default at the lower position when the aircraft is on the ground. The system will also lower the landing gear in an emergency, the event of motor failure, or on auto landing, to protect the aircraft and gimbal. You can lower or retract the landing gear using a switch when the aircraft's altitude is over 16.4' from the ground

Return to Home Failsafe

Assuming the GPS has been properly calibrated and enough satellites are available, the aircraft will automatically return to its home point in the event contact with the transmitter (radio controller) is ever lost

It is also possible to assign a button using the assistant software that, when pressed, will cause the aircraft to automatically return to the home point

One-Motor Fail Protection

Available when the aircraft is in attitude or GPS attitude mode. In the event one motor fails the aircraft can maintain a stable flying condition, enough that it can safely be brought back home and landed